of bakewell



Feb. 8 1927.

J. WADDELL STORAGE BATTERY CELL AND THE LIKE Original Filed Feb. 8, 1921 Reissued Feb. 8, 1927.

UNITED STATES PATENT OFFICE.

JOHN WADDELL, OF BAKEWELL, ENGLAND, ASSIGNOB TO D. I. BATTERY comm LIIITED, OF BAKEWELL, ENGLAND.

STORAGE-BATTERY CELL AND THE LIKE.

Original No. 1,488,721, date d Apr-111, 1924, Serial ll'o. 443,485, fl1ed February 8, 1921. Application for reissue fil ed Septemher'22, 1925. Serial No. 57,976.

This invention relates to storage battery cells and the like in the manufacture of which glass wool which consists of a yielding mass of very fine filaments, is emp oyed for separating the plates. Said wool is extreniiely porous and is unaffected by the acids use In practice it is usually wrapped around the positive plate, but as now used it is practically impossible to ensure that a layer of uniform density obtain over the whole surface of the plate and it is not proof against short circuits owing to finely divided peroxide from the positive plate gradually filling the interstices of the glass wool until contact is made with the negative plate and a short circuit formed. The main objects of the present invention are to provide an improved combination of parts constituting a storage battery and to provide a new or improved material for separating the plates.

According to the invention the lass wool is formed into more or less fiexi le sheets of uniform thickness and density by superimposing several layers of filaments upon one another and connecting them together by a suitable kind of cement such as gelatine or sodium silicate. The resultant sheet of what ma be described as glass wool felt is flexible an easily handled.

Fi 1 is a perspective view of an assembled liattery unit showing one use of my improved separator.

Fig. 2 is a diagrammatic view showing the manner of arranging the filaments of one layer of the separator at an angle to the adj acent layers.

a separator between the plates in a storage battery it is used in the following manner, a sheet of glass wool felt a is placed against the surface of the positive plates 6 on each side, and a thin sheet of porous wood a, is placed against the negative plates so that the separation of the plates is effected by the combination of a sheet of glass wool felt, and some kind of porous diaphragm, such as wood, perforated ebonite, etc. The

lass wool felt being held in close contact with both faces of the positive plate, prevents disintegration of the peroxide paste while any tendency for fine particles of peroxide to percolate through the wool so as to make contact with the negative plates, is

prevented b the wood or other porous diaphra m. T insheets of chemically treated woo or cellulose are preferably used in combination with the glass wool felt.

Owing to the very efiicient filter-like act1on of the glass wool felt, deposit is prevented in a very high de ee and conse quently the necessity for c caning out the cells is to a great extent obviated.

What I claim is Y 1. separator for electric accumulators comprism a plurality of flexible layers of glass woo, each of said layers havingthe filaments arranged in a definite order and the filaments of each layer being placed at an angle to the filaments of the adjacent layers.

2. separator for electric accumulators compr smg a plurality of layers of lass wool, each. of said superimposed layers avm the filaments arranged in a. definite or er. a

3. A separator for electric accumulators comprising a plurality'of layers of glass Wool ofuniform thickness and porosity, said layers being superimposed one upon another and adhesively secured together.

4. A separator for electric accumulators comprising a pluralit of superimposed layers of glass wool a hesively secured together.

5. separator for electric accumulators comprlsing a plurality of layers of glass wool of uniform thickness and porosity, said layers being superimposed one upon another and adhesively secured together by an adhesive material soluble in the electrolyte and free from material having deleterious effect on the battery plates.

that. separator for storage batteries compr1s1ng a plurality of separate layers of vitreous fibres adhesively secured together to form a sheet of uniform thickness and porosity and possessed of mechanical str ngth.

A separator for storage batteries comprising a stratified sheet of glass wool of uniform thickness and porosit possessed of mechanical strength and a fibrous unitary diaphragm of umform porosity.

8. A separator for storage batteries comprising a sheet formed of a plurality of superimposed layers of glass wool felt, said sheet" being of uniform thickness and porosity, and a permeable diaphragm in contact with said sheet.

9. In. combination, a positive plate, a negative plate, a separator for said plates comprising a se arate layer of stratified glass wool of uni orm thickness and porosity in contact with the, positive plate anda fibrous diaphragm between the glass wool and the negative plate.

10. In combination, a positive plate, a negative plate, a stratified sheet of glass wool felt of uniform thickness and porosity in contact with the positive plate and a permeable spacing and supporting plate in convnegative plate, a sheet of glass woo uniform thickness and porosity in contact tact with the negative plate, said supporting plate'being formed of treated wood.

11; In combination, a positive plate, a felt of with the positive plate and an imperforate sheet of wood in contact with the negative plate, said sheet comprising superimposed layers of filaments.

12. Aseparator including in combination a plurality of superposedlayers of vitreous fiber and a permeable wood diaphragm adapted to contact with at least one of said layers JOHN WADDELL. 

